I'm really annoyed with the changes in these three smileys in particular:
I used them a lot, and I don't like the way the new ones come across. The ones I miss... looked like this:
The new ones are horrible! They're so blurry and small that I can't even tell what they're supposed to represent without hovering my mouse cursor over them. Why on earth did you change them?
At least "wink" is still present as an alternative.